A general conversation is always safe because if you have something in common it will natually develop into something more interesting and if not you will find the conversation even in general terms stifled.
However even if the first date does not go down too well, please try again because very often on the first date both guys and girls are nervous or trying too hard. So give it another go, you never know…..
Good luck to all those looking for a shidduch and may this Bain Hazmanim bring many simchas.